diff --git a/composer.json b/composer.json
index 984c5b6..95cbe20 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
     "psr/log": "^1",
     "ramsey/uuid": "^4.2.3",
     "react/event-loop": "^1.4",
-    "react/promise": "^2.10",
+    "react/promise": "^3.3",
     "simshaun/recurr": "^5",
     "ipl/stdlib": ">=0.12.0"
   },
@@ -26,7 +26,7 @@
     "ext-ev": "Improves performance, efficiency and avoids system limitations. Highly recommended! (See https://www.php.net/manual/en/intro.ev.php for details)"
   },
   "autoload": {
-    "files": ["src/register_cron_aliases.php"],
+    "files": ["src/compat.php", "src/register_cron_aliases.php"],
     "psr-4": {
       "ipl\\Scheduler\\": "src"
     }
diff --git a/src/compat.php b/src/compat.php
new file mode 100644
index 0000000..538bce0
--- /dev/null
+++ b/src/compat.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace React\Promise;
+
+// CancellablePromiseInterface and ExtendedPromiseInterface extend PromiseInterface and were removed in v3.
+// These aliases make existing code compatible with the newest React\Promise.
+class_alias(PromiseInterface::class, CancellablePromiseInterface::class);
+class_alias(PromiseInterface::class, ExtendedPromiseInterface::class);